野生植物から羽化するＡｓｐｈｏｎｄｙｌｉａ属タマバエ類（双し目，タマバエ科）のダイズへの寄生転換実験

Abstract

Recent studies (YUKAWA, 1980; YUKAWA et al., 1981) on the life history, host plant range and parasite complex of the Japanese Asphondylia species indicated the possibility that the pod gall midge, Asphondylia sp. might be identical with some of those inhabiting wild hosts other than Leguminosae. To detect identical species in different hosts, host-change from the wild plants to in Asphondylia species were attempted in 1982 by using 2 x 2 x 2 m cages. Each cage covered 30 to 60 plants to prevent females of the pod gall midge from ovipositing naturally. The galls produced on such wild hosts as Ligustrum, Aucuba, Helwingia and Weigella were collected and placed in the cage in being separated from other hosts. Emergence, swarming and mating occurred normally under caged conditions in all the experiments, but the females that had mated flew upwards and rested on the ceiling of the cage throughout the night without showing any ovipositional activity. As a result, no infested pods could be recovered from the cultivated in the cages. However, the possibility of host-change cannot be discarded since the same findings were recorded even in cages where pods infested with the pod gall midge had been placed (soybean to experiments). The soybean to experiments tend to suggest that a pre-oviposition flight is necessary for the females that have mated to initiate an oviposition activity. Further should be carried out in larger cages to provide ample room for the flight.